mii: add Vitesse/Microsemi VSC8514

The VSC8514 Quad-Port 10/100/1000BASE-T PHY seems to match the handling
for the VSC8504 (for the little we support of what we could) and while
it works with our generic ukphy add it as vscphy for porper display of
names in the system message buffer and the like (or in case we decide
to implement some extra features).

Tested on: Ten64
MFC after: 3 days

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

mii: Remove unused devclass arguments to DRIVER_MODULE.

vscphy: Add support for PHY interrupts

They're allocated using standard newbus API,
which means that we rely on miibus to handle the allocation.
Add VSC8504 to the list of supported PHYs, as it is similar enough
to the VSC8501 that is already supported by this driver.

Obtained from: Semihalf
Sponsored by: Alstom Group
Differential revision: https://reviews.freebsd.org/D32816

vscphy: Fill in new mii_maxspeed field

It is used to limit the max advertised speed.
The value is read from DT by mii_fdt code.

Obtained from: Semihalf
Sponsored by: Alstom Group
Differential revision: https://reviews.freebsd.org/D32816

Add a driver for the Vitesse/Microsemi VSC8501 PHY.